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A New Worry About Tick Bites

A potentially devastating infection caused by tick bites is showing up on the East Coast, government researchers have found.

The condition, called babesiosis, is a malaria-like illness that results from infection with Babesia microti, a parasite that lives in red blood cells and is carried by deer ticks. Though far less common than Lyme disease, babesiosis can be fatal, particularly in people with compromised immune systems.

Because there is no widely used screening test for babesiosis, its spread poses a particular threat to the blood supply, scientists said. “We are very worried about it and are doing everything in our power to address this,” said Sanjai Kumar, chief of the laboratory of emerging pathogens at the Food and Drug Administration.